Double disk gate valve



March 30, 1937 E LUNKN v l 2,075,123

DOUBLE DISK GATE VALVE v Filed April 5, 193e Patented Mar. 30, 1937 UNITED s'lrxrrs PATENT oFFlcE The Lunkenheimer Company,

a corporation of Ohio Cincinnati, Ohio,

Application April 3, 1936, Serial No. 72,502

2 Claims.

. This invention relates to an improvement in .valves and particularly to double disk gate valves.

It is an object of this invention to provide means for easy attachment and detachment of the valve disks of a double disk gate valve to and from the valve stem.

It is a further object of this invention to provide such means of attachment of the valve disks .to the stem wherein upon removal of the valve stem from the valve casing, the valve disks will remain attached together and to the valve stem in such a manner as to be easily detached from one another and from the valve stem without the use of special or unusual tools.

It is a further object of this invention to provide such means, wherein the attachment of the valve disks to one another and to the valve stern is accomplished by the use of la single cotter or pm.

It is a further object of this invention to provide such means of connecting the Valve disks together as will permit of limited universal movement of the valve disks with respect to one another in order to secure close t, during operation, between the valve disks and their respective seats in the valve casing.

It is a further object of this invention to provide cooperating guide means for the purpose of preventing misalignment or binding of the valve disks in their travel from the closed position, wherein they are in close abutment with the valve seats, to the open position in which they are partially or wholly withdrawn from such contact, and vice versa.

In the drawing:

Figure 1 is a side elevational view, partly in section, of a valve having my invention applied thereto, with the valve disks in seated position;

Figure 2 is a View similar to Figure 1, but showing the valve disks in a position removed from the valve seats, the upper part of the valve having been broken away;

Figure 3 is a sectional View of the valve in the position shown in Figure 2, taken on the line 3-3 of Figure 2;

Figure 4 is an elevational View of one of the valve disks shown in Figures 1 and 2, as seen from the inner side thereof; and

i Figure 5 is a similar view of the other valve disk, as seen from the inner side thereof.

` Referring to the drawing in detail, the valve casing I is equipped with threaded pipe connectio-ns 2 andv3, which are adapted to receive screw 55 A.threadecilportionson pipesattached to the valve casing I. Adjacent the threaded portion 2 is a chamber 4, while a like chamber 5 is disposed adjacent the threaded portion 3. An aperture 6 leads from the chamber 4 through the inclined web 'I into -a central chamber 8 of the valve casing which is adapted to Vreceive the'valve disks. A flat annular valve seat 9 is disposed at an inclination to the vertical on the inner face of the inclined web 1, An aperture I8 leads from the chamber 5 through the web II into the central chamber 8. The web II, like the web 9, is inclined with respect'to the vertical but in a reverse direction. The web Il has a seat I2 disposed thereon. The valve casing IV has an upwardly extending portion which terminates in a threaded portion I4, which is adapted to threadedly receive the valve bonnet I5.

The valve bonnet I5, at the end adjacent the threaded portion I4 of the valve casing I, hask an interiorly threaded portion I6. At the top portion of the valve bonnet I5 is formed a packing space II, which is adapted to receive packing I8 therein. A cap member 20 is threaded on the eXteriorly threaded portion I9 of the stem casting and is adapted to engage a packing gland member 2l in order to draw it downwardlyv against the packing I8 in the packing space I'I for a purpose which will hereinafter'appear.

Disposed axially within the valve bonnet I5is a valve stem 22 which has a threaded portion 23 at the lower end thereof, which threaded por'- tion is adapted to cooperate with the interiorly threaded portionIE of the valve bonnet I5.Y The Vportion of the stem 22 above the threaded portion 23 thereof is cylindrical, save at its extreme Y top end, where it terminates in a square portion '24 and screw portion 25. The square portion 24 is adapted to receive thereover a complementary portion in .the hand wheel 26, and these complementary portions are secured together by'means of the nut 2l which is screw threaded on the screw portion 25 of the stem 22. Rotation of the handwheel 26, due to the engagement of the threaded portion 23 of the stem with the threaded portion :I5 of the stem guide will cause axial movementof the stem 22 in the valve vbonnet I5. At the lower end 'of the stein 22 is a head portion 29, which is separated by a reduced portion 28 from the lowerend of the threaded portion 23 of the valve stem. y

A pair of valve disks 30 and 3I is secured together'for limited universal movement in a rman-- ner whichwill be hereinafter described, and they are adapted to be' recipro'cated vertically inthe central chamber 8 ofithe valve, casingf I by engagement of the head portion 29 of the valve stem 22 with semi-annular socket 32 in the valve disk 3D and semi-annular socketr33 Vin valve disk 3|. The valve disks 38 and 3| are generally similar and the semi-annular sockets 32 and 33 are' identical and identically disposed with'respect to the valve disks. The outer faces of the disks are inclined in substantially the same manner and at substantially the same angle from the vertical, as are the valve seats 9 and I2 respectively. The

valve disk 38 is designated the female disk and` has, centrally arranged in its inner face, a. sub'-rstantially hemispherical recess 34. ijjAt' each'side of the recess 34 is a lug 35 which extends axially with respect to the recess 34 at each side thereof. Extending horizontally through the lugs 35 and radially with respect to the disk 30 is a pair of cotter or pin receiving bores or holes 36. Extending outwardlyvfrom opposite sides of the disk 30 is a flange 31, each of which is adapted to loosely engage agroove 58 vertically disposed in opposite sides ofthevalve casing I to guide the disk 38 in'its vertical movement therein. Extending through .the inner faces of the anges 31 in the same direction as the holes 36in lugs 35 are de- `pressions 38 `which are-of greater diameter than the holes 36. The disk 3| is designated the male disk and has a centrally arranged substantially heini-spherical boss 44 which is adapted to engage the recess 34- in the female disk 30. A hole or bore 46V extends axially through the boss 44 Y and is adapted to be aligned with the holes 36 in the respective lugs35 on the female disk 30. En-

larged'countersinks or depressions 45 are disposed at each side of the boss 44 and extend in the same l direction as the hole 46 inthe boss 44.

Flanges 41 similar to flanges 31 of disk 30 and similarly` disposed have depressions 48 on the inner face thereof, Ywhich are of cylindrical or elongated Vcontour and coaxial with the hole 46- inthe Vboss 44. iA stop lug 39 is disposed on the 'inner face of the lug 3D opposite the semi-annular vsocket 32 and is adapted to engage a stop lug 49 disks are placed together With the respective semiannular sockets 32 and 33 embracing the head portion 29 of the stem 22, the boss 44 of the male disk 3| being disposed .in the recess 34 ofthe female disk 30. The hole 46 in the boss 44 is .aligned with the holes 36 in the lugs 35 on the disk 30 and a cotter pin 50 is inserted-therethrough, entrance of the cotter to the holes 36 and 46V being provided for by the recesses 38 and 48 in the respective valve disks. The respective flanges 31 and 41 have their outer faces adapted to'slidably engage the guide grooves 58 in the casing I.. Axial movement ofthe valve stem 22V Ywill 'cause reciprocation' of theV connected .valve disks'30 and 3| in the guide4 grooves 50 in the valve casing I. The connection of the valve disks 3IJ` and 3| to one another and Vto thevalve stem 22 and the engagement of the flanges 31 and 41 of the respective plates in the' guide grooves 58 is sufficiently loosefto: permit of a desired amount of universal movement of the valve disks 30 and 3| with respect to one another. This movement .tachment of the disks 38 and 3| from the stem 22 because, before the head portion 29 of the stem 22 is released from the sockets 32 and 33, the cotter 50 must first be removed from its connecting relation. This removal of the cotter 50 is preferably accomplished by manipulation of the hand Wheel 26, screwing the stem 22 upwardly a.l

sufficient distance to remove the respective valve disks 30 and-3| from their seats. .When this has been accomplished, thevalve bonnet I5'may be unscrewed from the threaded. portion I4 of the valvecasing I. The valve bonnet, valve stem and attached valve disks 38 and 3| may be bodily removed upwardly from the valve casing I. After this removal'has been accomplished, the cotter may be removed bythe use of a cotter pulling tool or may be driven out, by means of a punch, from its position in theholesV 35 and 36, and the disks 38 and 3| may then be removed from the these members. It is to be particularly noted that, by my invention, the stem 22 maybe 4removed from the valve casing I withouta'ccdental detachment therefrom of the valvedisks 30 and 3| It is to be understood that the cotter which is shown'to 'be of the split or expanding type may .be of any desired type of pintle member and that, when use is made` of such` a cotter as has been illutrated, the expansion thereof may be so slight as topermit, of its removal without the use of tools, while at the same timer the cotter is prevented from axial displacement by the engagement of the respective flanges 31 and 41. with the grooves 58 in the valve casing .I. Y

Furthermore," when an expanding type of cotter, as shown, is used it will provide a-'slight desirable Vamount of` resiliency inthe connectionV between the valve disks which Vwill Yprevent vthe occurence of hammer upon' operation` of the stem 22 forthe purpose of re-facing or replacing valve. It is, of course, to be understoodthat, 'k

when such cotters are used, the resiliency thereof will prevent axial diplacement of the pin rela- In lusing cotters of simple cylindrical type, such pins are preferably of a length more nearly equal to the distance between the grooves 58 of the valve casing and the heads thereof are preferably provided with surfaces which will slide with little friction in the grooves SILr It is to be understood that the above description and illustrationV in the drawings is merely illustrative and in no wise limiting, and that I desire to comprehend within my invention such modifications Yas come within the scope of the claims and the invention.

Having thus fully described my invention, what I claim as new and desire torsecure by Letters `4:0 tive to the holes 36 and 46 in the respective disks.

of said stem, and means of connection between` said disks Vcomprising complementary apertured projecting parts on eachof said disks and a removable pin extending through said apertures said disks having thereon cooperating stop projectionsk on the opposite side of .said Apin from said sockets whereby to limit relative `motion about said removable pin to retain the head of said stem in said sockets until s'aidA removable pin is `removed.

2. In a valve having a casing with opposed seats adapted to be engaged by the outer .faces of ay pair of valve disks having oppositely disposed opposite sides of said casing and to be moved in said guides by an axially movable stem having a headv thereon; means for connecting said disks together, for limited relative movement, and to said stem comprising an arcuate recess in the inner face of one disk, a pair of lugs at opposite sides of said recess having holes therethrough disposed transversely of the stem, an arcuate boss in the other disk having a hole therethrough, a semi-annular socket in each disk, said sockets being complementary and being adapted to rotatably receive the head of said stem, and a pin extending through the holes in said boss and said lugs and being retained from displacement therefrom by the walls of said casing.

EDMUND H. LUNKEN. 

